Movable seat unit and movable seat

Abstract

The present application relates to a movable seat unit, comprising a handrail side plate (1) supported on the ground; a mechanical stretching device (2) comprising a seat frame (21) for attaching a seat part, a backrest assembly (22) arranged at the rear of the seat frame (21) for attaching a backrest, and a leg stretching device (23) pivotally connected to the front of the seat frame (21), wherein a guide rail (11) extending in the front-rear direction of the seat unit is arranged on the handrail side plate (1), and the seat frame (21) is slidingly connected with the guide rail (11); the lower end of the backrest mounting member is pivotally connected with the rear of the seat frame (21), and the lower end of the follow-up connecting rod (222) is pivotally connected to a fixed hinge point relative to the position of the handrail side plate (1), so that when the seat frame (21) slides forward, the pivot point of the lower end of the backrest mounting member and the rear of the seat frame moves forward. In addition, the present application also relates to a movable seat.

Description

TECHNICAL FIELD

[0001] The present application relates to a movable seat unit, and further relates to a movable seat comprising the seat unit. BACKGROUND

[0002] There are various movable seat units known in the art, such as sofas or chairs with multi-position conversion function. With the improvement of people's living standards, the comfort requirement of sofas and chairs is also increasing. In the known designs, the movable seat unit is usually provided with a mechanical extension device, by which the seat unit can be converted between a sitting position, a leisure position (or TV position) and a lying position. When the seat unit is converted from the sitting position to the leisure position, the ottoman of the seat unit is extended forward, and the angle between the backrest and the seat part is substantially unchanged. When the seat unit is converted from the leisure position to the lying position, the ottoman is further extended forward and lifted upward compared with the leisure position, and the backrest is significantly reclined. However, in the existing movable seats with a lying position, the backrest is often moved backward sharply in the lying position, thereby requiring more space for furniture placement. In order to solve this technical problem, some so-called "zero wall" solutions have also been proposed. However, these product types are often complex in structure and high in manufacturing cost. SUMMARY

[0003] Therefore, the present application aims to provide a movable seat which is simpler in structure, more flexible and convenient in operation, and smaller in required installation space.

[0004] To solve the above technical problem, the present application provides a movable seat unit, comprising a pair of handrail side plates supported on the ground in parallel; a mechanical extension device arranged between the handrail side plates, comprising a seat frame for attaching a seat part, a backrest assembly arranged at the rear of the seat frame for attaching a backrest, and a leg extension device pivotally connected to the front of the seat frame, wherein a guide rail extending in the front-rear direction of the seat unit is arranged on the handrail side plate, and the seat frame is in sliding fit connection with the guide rail; and an electric drive unit, by which the seat frame can be slid forward and backward relative to the handrail side plate along the guide rail, so as to convert the seat unit between a sitting position, a TV position and a lying position. In the sitting position, the backrest is upright, and the leg extension device is retracted below the seat part. In the TV position, the leg extension device is extended forward of the seat part. In the lying position, the leg extension device is extended forward of the seat part, and the seat frame is slid forward and the backrest is inclined at a larger angle compared with the TV position or the sitting position.

[0005] According to the present application, the backrest assembly comprises a backrest mounting and a follower link, the upper end of the backrest mounting is attached to the backrest and pivotally connected to the upper end of the follower link, the lower end of the backrest mounting is pivotally connected to the rear part of the seat frame, and the lower end of the follower link is pivotally connected to a fixed hinge point relative to the position of the armrest side plate, so that when the seat frame slides forward, the pivot point of the lower end of the backrest mounting and the rear part of the seat frame moves forward.

[0006] According to the present application, preferably, the highest point of the backrest has a downward and forward moving tendency when the seat frame slides forward. It is to be noted that the downward and forward moving tendency of the highest point of the backrest does not exclude temporary or small distance backward movement of the highest point of the backrest. In this embodiment, as the seat frame moves forward, the lower end of the backrest mounting and the seat frame hinge moves forward, so that the included angle between the backrest mounting and the follower link increases, and the backrest mounting as a whole moves forward with the seat frame, driving the backrest to move forward while tilting, so that the highest point of the backrest moves downward and forward if necessary. In this way, the requirement for the space behind the seat is reduced.

[0007] Preferably, the seat frame comprises two seat frame longitudinal beams extending in parallel along the front-rear direction of the seat unit and at least one seat frame cross beam transversely connected between the two longitudinal beams, and a leg cross beam connected between the leg stretching devices, wherein the seat frame longitudinal beams are in sliding fit connection with the guide rails.

[0008] In a preferred embodiment, the electric drive unit comprises a seat frame actuator acting between the armrest side plate and the seat frame, and a leg actuator acting between the seat frame and the leg stretching devices. In this embodiment, the electric drive unit controls the seat frame and the leg stretching devices independently through the two actuators, so as to realize more flexible position transformation.

[0009] Preferably, one end of the seat frame actuator is fixedly arranged relative to the position of the armrest side plate, and the other end of the seat frame actuator is connected to the seat frame cross beam, wherein the extension and contraction of the seat frame actuator promotes the forward and backward sliding of the seat frame relative to the armrest side plate.

[0010] Preferably, one end of the leg actuator is connected to the seat frame cross beam, and the other end of the leg actuator is connected to the leg cross beam, wherein the extension and contraction of the leg actuator promotes the unfolding or folding of the leg stretching devices.

[0011] In another preferred embodiment, the electric drive unit is configured as a seat actuator acting between the armrest side plate and the leg stretching devices. In this embodiment, the electric drive unit realizes the common control of the seat frame, the backrest and the leg stretching devices through only one actuator.

[0012] Preferably, one end of the seat actuator is fixedly arranged relative to the armrest side panel, and the other end of the seat actuator is connected to the leg crossbeam, wherein the seat actuator is used to sequentially drive the leg extension device and the seat frame to move in sequence.

[0013] Preferably, the adjustment stroke of the seat actuator is divided into two stages, in the first stage, the leg extension device moves relative to the seat frame, and in the second stage, the seat frame slides relative to the armrest side panel.

[0014] In this embodiment, the electric drive unit is used to drive the seat unit to sequentially change between the sitting position, the TV position and the lying position by means of only one actuator.

[0015] To solve the technical problem, a movable seat unit is provided, which comprises a pair of parallel arranged armrest side panels supported on the ground; a mechanical extension device arranged between the armrest side panels, the mechanical extension device comprising a seat frame for attaching a seat part, a backrest assembly arranged at the rear of the seat frame for attaching a backrest, and a leg extension device pivotally connected to the front of the seat frame, wherein a guide rail extending in the front-rear direction of the seat unit is arranged on the armrest side panel, and the seat frame is in sliding fit connection with the guide rail; a seat actuator acting between the armrest side panel and the leg extension device, by means of which the seat frame can slide along the guide rail relative to the armrest side panel, so as to sequentially change the seat unit between a sitting position, a TV position and a lying position, in the sitting position, the backrest is upright, and the leg extension device is folded under the seat part, in the TV position, the leg extension device is extended in front of the seat part, and in the lying position, the leg extension device is extended in front of the seat part, and the seat frame slides forward and drives the backrest to tilt at a larger angle.

[0016] According to the present application, the backrest assembly is configured as a four-bar linkage consisting of a backrest mounting, a follower link, a first backrest auxiliary link and a second backrest auxiliary link, wherein the upper end of the backrest mounting is attached to the backrest, the lower end of the backrest mounting is hinged to the upper end of the follower link, and the lower end of the follower link is pivotally connected to a hinge point fixed relative to the armrest side panel, so that when the seat frame slides forward, the lower end of the backrest mounting moves forward with the pivot point at the rear of the seat frame. According to this embodiment, preferably, when the seat frame slides forward, the highest point of the backrest has a tendency to move downward and forward. In this embodiment, when the seat frame slides forward along the guide rail relative to the armrest side panel, the first backrest auxiliary link is driven to move forward, so that the four-bar linkage changes in shape, wherein the backrest mounting rotates at a larger tilt angle and moves forward and downward as a whole, so that the highest point of the backrest moves downward, and if necessary, also moves forward.

[0017] Preferably, the lower end of the backrest mounting is also hingedly connected to the upper end of a second backrest auxiliary link, one end of the first backrest auxiliary link being hingedly connected to the middle portion of the follower link, the other end being pivotally connected to the rear portion of the seat frame, and the lower end of the second backrest auxiliary link being hingedly connected to the middle portion of the first backrest auxiliary link.

[0018] Preferably, the adjustment stroke of the seat actuator is divided into two phases which are implemented in sequence, in the first phase, the leg stretching device moves relative to the seat frame, and in the second phase, the seat frame slides relative to the armrest side plate.

[0019] To solve the technical problem, the application also provides a movable seat comprising the above seat unit. BRIEF DESCRIPTION OF DRAWINGS

[0020] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0021] Figure 1 Fig. 1 schematically shows a perspective view of a movable seat unit according to a first embodiment of the application;

[0022] Figure 2 Fig. 2 schematically shows Figure 1 Fig. 3 shows another perspective view of the seat unit shown in Fig. 1;

[0023] Figure 3a Fig. 4 schematically shows 3b Fig. 5 schematically shows Figure 1 Fig. 6 shows the disassembled parts of the seat unit shown in Fig. 1;

[0024] Figure 4 Fig. 7 schematically shows Figure 1 Fig. 8 shows a side view of the seat unit shown in Fig. 1 in a sitting position;

[0025] Figure 5 Fig. 9 schematically shows Figure 1 Fig. 10 shows a side view of the seat unit shown in Fig. 1 in a TV position;

[0026] Figure 6 Fig. 11 schematically shows Figure 1 Fig. 12 shows a side view of the seat unit shown in Fig. 1 in a lying position;

[0027] Figure 7 Fig. 13 schematically shows a perspective view of a movable seat unit according to a second embodiment of the application;

[0028] Figure 8 Fig. 14 schematically shows Figure 7 Fig. 15 shows a partial perspective view of the seat unit shown in Fig. 13;

[0029] Figure 9 Fig. 16 schematically shows Figure 7 Fig. 17 shows a side view of the seat unit shown in Fig. 13 in a sitting position;

[0030] Figure 10 Fig. 18 schematically showsFigure 7 side view of the seat unit TV position shown;

[0031] Figure 11 schematically shows Figure 7 side view of the seat unit lying position shown;

[0032] Figure 12 schematically shows a partial side view of an alternative embodiment according to the present application;

[0033] Figure 13 schematically shows Figure 12 another side view of the embodiment shown. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0035] The term "one embodiment" or "an embodiment" as used herein means that a particular implementation can include a particular feature, structure, or characteristic, but every embodiment can not necessarily include the particular feature, structure, or characteristic. Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like refer to the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0036] Figures 1 to 6 An articulating seat unit according to a first embodiment of the present application is schematically shown. The seat unit is configured as an armrest floor-type articulating seat.

[0037] The seat unit includes a pair of parallel armrest side plates 1, on which armrest cushions not shown in the figure are respectively installed. The armrest side plates 1 support the seat unit on the ground. On the inner side surface of the armrest side plates 1, guide rails 11 extending in the front-rear direction of the seat unit are configured. The side plate cross beam 12 is fixedly installed between the two armrest side plates 1 by means of anchors. A mechanical extension device 2 is installed between the armrest side plates 1 for changing the seat unit between different positions.

[0038] The mechanical extension device 2 includes a seat frame 21 for attaching the seat part. The seat frame 21 includes two first seat frame longitudinal beams 211a and second seat frame longitudinal beams 211b that extend parallel in the front-rear direction of the seat unit and a seat frame cross beam 212 that is horizontally connected between the first and second seat frame longitudinal beams. The first seat frame longitudinal beam 211a and the second seat frame longitudinal beam 211b are respectively in sliding fit with the guide rails 11 on the inner side surface of the armrest side plates, so that the seat frame 21 can slide back and forth relative to the armrest side plates along the guide rails 11.

[0039] The rear part of the seat frame 21 is connected to the backrest assembly 22. The backrest assembly 22 includes a backrest mounting member 221 and a follower link 222. In an Figures 1 to 6 embodiment as shown, the lower end of the backrest mounting member 221 is hinged to the rear ends of the first and second seat frame longitudinal beams. The upper end of the backrest mounting member 221 is bifurcated. One bifurcated part is attached to the backrest, and the top of the other bifurcated part is pivotally connected to the upper end of the follower link 222. The lower end of the follower link 222 is pivotally connected to the side plate cross beam 12.

[0040] A leg extension device 23 is provided at the front part of the seat frame 21. The leg extension device 23 is composed of a plurality of interconnected pivotally connected linkages in a known manner. Among them, the rear end of the first leg link 232 is hinged to the front end of the seat frame 21. The front end of the first leg link 232 is hinged to the rear end of the second leg link 233. The rear end of the third leg link 234 is hinged to the front end of the seat frame 21. The front end of the third leg link 234 is hinged to the rear end of the fourth leg link 235. The second leg link 233 and the fourth leg link 235 are respectively hinged to the footrest 236 at their front ends. Among them, a leg cross beam 231 is installed between the first leg links 232.

[0041] The seat unit further includes an electric drive unit 3. By means of the electric drive unit, the seat frame 21 can slide back and forth relative to the armrest side plates 1 along the guide rails 11, prompting the seat unit to change between a sitting position, a TV position and a lying position.

[0042] In Figures 1 to 6In the first embodiment shown, the electric drive unit 3 comprises a seat frame actuator 31 for driving the seat frame 21 to slide along the guide rail 21 relative to the armrest side panel 1 and a leg actuator 32 for driving the leg extension device 23 to extend and retract relative to the seat frame 21, wherein the seat frame actuator 31 and the leg actuator 32 are capable of operating independently of each other, so that the forward and backward sliding of the seat frame 21 and the extension and retraction of the leg extension device can be implemented independently of each other.

[0043] The seat frame actuator 31 is configured as a linear actuator, such as Figure 3a As shown, the motor head of the seat frame actuator 31 is mounted on the side panel cross beam 12, and the extendable actuating rod acts on the seat frame cross beam 212.

[0044] The leg actuator 32 is also configured as a linear actuator, such as Figure 3b As shown, the motor head of the leg actuator 32 is mounted on the seat frame cross beam 212, and the extendable actuating rod acts on the leg cross beam 231.

[0045] Figure 4 The seat unit is shown in a sitting position, in which the backrest attached to the backrest mounting member 221 is upright, and the leg extension device 23 is retracted under the seat frame 21. At this time, if only the leg actuator 32 is extended, the leg cross beam 231 is pushed to move forward, and the leg extension device 23 is unfolded, so that the transformation from the sitting position shown in Figure 4 to the TV position shown in Figure 5 is realized.

[0046] Starting from the TV position shown in Figure 5 , if the seat frame actuator 31 is extended, the seat frame cross beam 212 is pushed to slide forward along the guide rail 11, together with the first seat frame longitudinal beam 211a and the second seat frame longitudinal beam 211b fixedly connected thereto. At the same time, the included angle between the backrest mounting member 221 and the follow-up connecting rod 222 increases, and the pivot point at the lower end of the backrest mounting member 211 and the rear part of the seat frame 21 moves forward, so that the backrest mounting member 211 as a whole moves forward with the seat frame 21, and the backrest moves forward while tilting, so that the highest point of the backrest moves downward. Thus, the transformation from the TV position shown in Figure 5 to the lying position shown in Figure 6 is realized.

[0047] Of course, starting from the sitting position shown in Figure 4 , only the seat frame actuator 31 can be extended, so that the seat frame 21 slides forward along the guide rail 11, the backrest tilts, and the leg extension device 23 remains retracted under the seat frame 21.

[0048] The corresponding reverse position transformation of the seat unit is realized by the retraction of the actuating rods of the actuators, which will not be described here.

[0049] Figures 7 to 11 A second embodiment according to the present application is shown. The second embodiment differs from the first embodiment in the configuration of the electric drive unit 3. According to the second embodiment, the electric drive unit 3 is configured as a seat actuator 33. As shown, the seat actuator 33 is configured as a linear actuator, the motor head of which is mounted on the side plate cross beam 12 of the armrest side plate 1, and the extendable actuating rod of which acts on the leg cross beam 231. Figure 7

[0050] The adjustment stroke of the seat actuator 33 is divided into two phases which are implemented in succession. Here, the explanation is given by way of example for the successive transformation of the seat unit between the sitting position, the TV position and the lying position. Figures 9 to 11

[0051] In the first phase, only the leg extension device is extended relative to the seat frame. Specifically, when the seat actuator 33 is extended, the seat frame 21 remains in position relative to the armrest side plate 1 and the backrest attitude also remains unchanged due to the weight of the user sitting on the seat. The actuating rod only pushes the leg cross beam 231 to move forward, thereby causing the leg extension device 23 to unfold, so that the seat unit is transformed from the sitting position shown in Figure 9 to the TV position shown in Figure 10 .

[0052] In the second phase, the seat frame is slid forward and backward relative to the armrest side plate. Specifically, when the actuating rod of the seat actuator continues to extend until the leg extension device 23 is unfolded to the maximum extent, the leg extension device causes the seat frame 21 to slide forward along the guide rail 11 relative to the armrest side plate 1. At the same time, the angle between the backrest mounting 221 and the follow-up link 222 increases, and the backrest mounting 221 as a whole moves forward with the seat frame 21, causing the backrest to move forward while tilting, so that the highest point of the backrest moves downward, realizing the transformation of the seat unit from the TV position shown in Figure 10 to the lying position shown in Figure 11 .

[0053] Alternatively, in the second embodiment, a sequence spring 25 can also be provided as shown in Figure 8 . The sequence spring 25 acts between the seat frame 21 and the leg extension device 23. As shown, one end of the sequence spring 25 is connected to the inner side of the seat frame longitudinal beam, and the other end is connected to the link of the leg extension device. The sequence spring 25 more reliably ensures the successive transformation of the seat unit between the sitting position, the TV position and the lying position, preventing the order of attitude transformation from being disturbed. Figure 8

[0054] Figure 12 ​​​A partial side view schematically shows an alternative of the second embodiment. The seat unit according to the alternative comprises a pair of handrail side plates 1 supported on the ground in parallel, a mechanical stretching device 2 disposed between the handrail side plates 1, the mechanical stretching device 2 comprising a seat frame 21 for attaching a seat part, a backrest assembly 22' disposed at the rear of the seat frame 21 for attaching a backrest, and a leg stretching device 23 pivotally connected with the front of the seat frame 21, wherein a guide rail 11 extending in the front-rear direction of the seat unit is disposed on the handrail side plates 1, and the seat frame 21 is in sliding fit connection with the guide rail 11.

[0055] According to the alternative, the backrest assembly 22' is configured as a four-bar linkage consisting of a backrest mounting member 221', a follower link 222', a first backrest auxiliary link 223, and a second backrest auxiliary link 224. The upper end of the backrest mounting member 221' is attached to the backrest, and the lower end of the backrest mounting member 221' is hingedly connected with the upper end of the follower link 222' and the upper end of the second backrest auxiliary link 224, respectively, the lower end of the follower link 222' is pivotally connected on a hinged point fixed in position relative to the handrail side plate 1, for example, the side plate cross beam 12, one end of the first backrest auxiliary link 223 is hingedly connected at the middle of the follower link 222', and the other end is pivotally connected with the rear of the seat frame 21, and the lower end of the second backrest auxiliary link 224 is hingedly connected at the middle of the first backrest auxiliary link 223.

[0056] When the seat frame 21 slides forward along the guide rail 11 relative to the handrail side plate 1, the first backrest auxiliary link 223 is driven to move forward, causing the four-bar linkage to change in form, in which the backrest mounting member 221' rotates in the counterclockwise direction in the figure and moves forward and downward as a whole, thereby moving the highest point of the backrest downward, as shown in Figure 13

[0057] The seat actuator 33 is configured as a linear actuator, the motor head of which is mounted on the side plate cross beam 12 of the handrail side plate 1, and the extendable actuating rod acts on the leg cross beam 231.

[0058] The adjustment stroke of the seat actuator 33 is divided into two stages implemented in sequence, in the first stage, the leg stretching device 23 moves relative to the seat frame 21, and in the second stage, the seat frame 21 slides relative to the handrail side plate 1, thereby causing the seat unit to sequentially change between the sitting position, the TV position, and the lying position. The specific position changing manner is similar to the second embodiment, and will not be described here.

[0059] List of reference signs

[0060] 1 handrail side plate

[0061] 11 guide rail

[0062] 12 side plate cross beam​

[0063] 2 mechanical extension device

[0064] 21 seat frame

[0065] 211a first seat frame longitudinal beam

[0066] 211b second seat frame longitudinal beam

[0067] 212 seat frame cross beam

[0068] 22 backrest assembly

[0069] 221, 221' backrest mount

[0070] 222, 222' follower link

[0071] 223 first backrest auxiliary link

[0072] 224 second backrest auxiliary link

[0073] 23 leg extension device

[0074] 231 leg cross beam

[0075] 232 first leg link

[0076] 233 second leg link

[0077] 234 third leg link

[0078] 235 fourth leg link

[0079] 236 footrest

[0080] 25 sequence spring

[0081] 3 electric drive unit

[0082] 31 seat frame actuator

[0083] 32 leg actuator

[0084] 33 seat actuator

Claims

1. A movable seat unit comprising - a pair of handrail side plates (1) supported on the ground in parallel; - mechanical extension device (2) arranged between the armrest side panels (1) comprising a seat frame (21) for attaching a seat part, a backrest assembly (22) arranged at the rear of the seat frame (21) for attaching a backrest and a leg extension device (23) pivotally connected with the front of the seat frame (21), wherein the seat frame (21) comprises two seat frame longitudinal beams (211a, 211b) extending in parallel in the front-rear direction of the seat unit and at least one seat frame transverse beam (212) transversely connected between the two longitudinal beams, a guide rail (11) extending in the front-rear direction of the seat unit is arranged on the handrail side plate (1), the seat frame longitudinal beams (211a, 211b) are in sliding fit connection with the guide rail (11); - an electric drive unit (3) by means of which the seat frame (21) can be caused to slide along the guide rail (11) relative to the handrail side plate (1) in the front-rear direction, causing the seat unit to be transformed between a sitting position in which the backrest is upright and the leg stretching device (23) is retracted below the seat, a TV position in which the leg stretching device (23) is extended in front of the seat, and a lying position in which the leg stretching device (23) is extended in front of the seat, the seat frame (21) is slid forward and the backrest is tilted at a greater angle; wherein the backrest assembly (22) comprises a backrest mounting (221) and a follower link (222), the upper end of the backrest mounting (221) is attached to the backrest and is pivotally connected to the upper end of the follower link (222), the lower end of the backrest mounting (221) is pivotally connected to the rear part of the seat frame (21), the lower end of the follower link (222) is pivotally connected to a hinge point fixed in position relative to the handrail side plate (1), so that when the seat frame (21) is slid forward, the pivot point of the lower end of the backrest mounting (221) and the rear part of the seat frame (21) moves forward.

2. The seating unit of claim 1, wherein, When the seat frame (21) is slid forward, the highest point of the backrest has a tendency to move downward and forward.

3. The seating unit of claim 1, wherein, Between the leg stretching devices is connected a leg transverse beam (231).

4. The seating unit of claim 3, wherein, The electric drive unit (3) comprises a seat frame actuator (31) acting between the handrail side plate (1) and the seat frame (21) and a leg actuator (32) acting between the seat frame (21) and the leg stretching device (23).

5. The seating unit of claim 4, wherein, One end of the seat frame actuator (31) is fixed in position relative to the handrail side plate (1), the other end of the seat frame actuator (31) is connected to the seat frame transverse beam (212), wherein the extension and retraction of the seat frame actuator (31) causes the seat frame (21) to slide in the front-rear direction relative to the handrail side plate (1).

6. The seating unit of claim 4, wherein, One end of the leg actuator (32) is connected to the seat frame transverse beam (212), the other end of the leg actuator (32) is connected to the leg transverse beam (231), wherein the extension and retraction of the leg actuator (32) causes the leg stretching device (23) to be extended or retracted.

7. The seating unit of claim 3, wherein, The electric drive unit (3) is configured as a seat actuator (33) acting between the handrail side plate (1) and the leg stretching device (23).

8. The seating unit of claim 7, wherein, One end of the seat actuator (33) is fixedly arranged relative to the armrest side plate (1), and the other end of the seat actuator (33) is connected to the leg cross beam (231), wherein the leg folding device (23) and the seat frame (21) are sequentially moved by the extension and contraction of the seat actuator (33).

9. The seating unit of claim 8, wherein, The adjustment stroke of the seat actuator (33) is divided into two stages, in the first stage, the leg stretching device (23) moves relative to the seat frame (21), and in the second stage, the seat frame (21) slides relative to the armrest side plate (1).

10. A movable seat unit, comprising a pair of armrest side plates (1) supported on the ground in parallel; - mechanical extension means (2) arranged between the armrest side panels (1), said mechanical extension means (2) comprising a seat frame (21) for attaching a seat part, a backrest assembly (22') arranged at the rear of the seat frame (21) for attaching a backrest, and a leg extension means (23) pivotally connected with the front of the seat frame (21), wherein, The seat frame (21) comprises two seat frame longitudinal beams (211a, 211b) extending in the front-rear direction of the seat unit and at least one seat frame cross beam (212) transversely connected between the two longitudinal beams, a guide rail (11) extending in the front-rear direction of the seat unit is arranged on the armrest side plate (1), and the seat frame longitudinal beams (211a, 211b) are in sliding fit connection with the guide rail (11); a seat actuator (33) acting between the armrest side plate (1) and the leg stretching device (23), by means of which the seat frame (21) can slide along the guide rail (11) relative to the armrest side plate (1) to sequentially change the seat unit between a sitting position, a TV position and a lying position, in the sitting position, the backrest is upright, and the leg stretching device (23) is folded under the seat, in the TV position, the leg stretching device (23) is stretched to the front of the seat, and in the lying position, the leg stretching device (23) is stretched to the front of the seat, the seat frame (21) slides forward and drives the backrest to tilt at a larger angle; Wherein, the backrest assembly (22') is configured as a four-bar linkage consisting of a backrest mounting member (221'), a follower link (222'), a first backrest auxiliary link (223) and a second backrest auxiliary link (224), wherein the upper end of the backrest mounting member (221') is attached to the backrest, the lower end of the backrest mounting member (221') is hinged to the upper end of the follower link (222'), and the lower end of the follower link (222') is pivotally connected to a hinge point fixed relative to the armrest side plate (1), so that when the seat frame (21) slides forward, the lower end of the backrest mounting member (221) moves forward with the pivot point of the rear part of the seat frame (21).

11. The seating unit of claim 10, wherein, When the seat frame (21) slides forward, the highest point of the backrest has a tendency to move downward and forward.

12. The seating unit of claim 10, wherein, The lower end of the backrest mounting member (221') is also hinged to the upper end of the second backrest auxiliary link (224), one end of the first backrest auxiliary link (223) is hinged to the middle part of the follower link (222'), the other end is pivotally connected to the rear part of the seat frame (21), and the lower end of the second backrest auxiliary link (224) is hinged to the middle part of the first backrest auxiliary link (223).

13. The seating unit of claim 10, wherein, The adjustment stroke of the seat actuator (33) is divided into two phases which are carried out in succession, in a first phase the leg rest device (23) is moved relative to the seat frame (21) and in a second phase the seat frame (21) is slid relative to the armrest side panel (1).

14. A movable seat comprising a seat unit according to any one of the preceding claims.

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